- American Heart Walk - Orange County - The American Heart Association's Irvine California Heart Walk. Location, event and donation information.
- California Martial Arts Academy - Children's and adults' programs. Locations in Irvine, Mission Viejo, and Rancho Santa Margarita.
- Irvine Ranch Land Reserve - Offers parks, trails and wilderness for recreational activities.
- Nishiki Koi Club - Includes members' ponds, information on keeping koi, and meeting details.
- PlayOCgolf - Information about Orange County golf courses.
- The Legacy Project - Documents the transformation of the shuttered El Toro Marine Corps Air Station into a metropolitan park, the Orange County Great Park, by oral history, photographs and video.
